Ye Jun, Chen Zhan, Wang Kai, An Feifei, Yuan Yi, Chen Wencheng, Yang Qingdan, Zhang Xiaohong, Lee Chun-Sing
Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR (P. R. China).
Chemistry. 2014 Oct 13;20(42):13762-9. doi: 10.1002/chem.201402925. Epub 2014 Sep 3.
Multifunctional donor-acceptor compound 4,4'-bis(dibenzothiophene-S,S-dioxide-2-yl)triphenylamine (DSTPA) was obtained by linking a strongly electron-withdrawing core and a strongly electron-donating core with a biphenyl bridge in linear spatial alignment. DSTPA not only has suitable HOMO and LUMO levels for easily accepting both holes and electrons, it was also demonstrated to have a high fluorescence quantum yield of 0.98 and a high triplet energy level of 2.39 eV. Versatile applications of DSTPA for bipolar transport, green fluorescent emission, and sensitizing a red phosphor were systematically investigated in a series of multi- and single-layer organic light-emitting devices. In traditional multilayer devices, it shows excellent performance both in an undoped fluorescent device (used as a green emitter and achieving maximum current and power efficiencies (CE and PE) of 12.6 cd A(-1) and 9.4 Lm W(-1) , respectively) and in a red phosphorescent device (used as a host and achieving maximum CE and PE of 26.4 cd A(-1) and 26.3 Lm W(-1) , respectively). Furthermore, DSTPA was also simultaneously used as an emitter, a hole transporter, and an electron transporter in a single-layer device showing CE and PE of 5.1 cd A(-1) and 4.7 Lm W(-1) , respectively. A single-layer red phosphorescent device with efficiencies of 11.7 cd A(-1) and 12.6 Lm W(-1) was obtained by doping DSTPA with a red phosphor. The performances of all of the devices in this work are comparable to the best of their corresponding classes in the literature.
多功能给体-受体化合物4,4'-双（二苯并噻吩-S,S-二氧化物-2-基）三苯胺（DSTPA）是通过将一个强吸电子核心和一个强供电子核心用联苯桥以线性空间排列连接而获得的。DSTPA不仅具有适合同时容易接受空穴和电子的HOMO和LUMO能级，还被证明具有0.98的高荧光量子产率和2.39 eV的高三重态能级。在一系列多层和单层有机发光器件中系统地研究了DSTPA在双极传输、绿色荧光发射和敏化红色磷光体方面的多种应用。在传统的多层器件中，它在未掺杂的荧光器件（用作绿色发光体，分别实现最大电流效率和功率效率（CE和PE）为12.6 cd A⁻¹和9.4 Lm W⁻¹）和红色磷光器件（用作主体，分别实现最大CE和PE为26.4 cd A⁻¹和26.3 Lm W⁻¹）中均表现出优异的性能。此外，DSTPA还在单层器件中同时用作发光体、空穴传输体和电子传输体，该单层器件的CE和PE分别为5.1 cd A⁻¹和4.7 Lm W⁻¹。通过用红色磷光体掺杂DSTPA获得了效率为11.7 cd A⁻¹和12.6 Lm W⁻¹的单层红色磷光器件。这项工作中所有器件的性能与文献中相应类型的最佳性能相当。
